Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Deferred tax assets:
Net operating loss carryforwards	$ 209.0	$ 227.6
Finance and operating lease obligations	19.8	21.6
Pension and postretirement benefits	32.8	35.8
Employee benefits	3.9	4.7
Interest limitation	48.8	16.7
State tax credit	7.4	8.0
Other	30.8	23.4
Total deferred tax assets	352.5	337.8
Valuation allowance	(32.8)	(15.7)
Total deferred tax assets, net of valuation allowance	319.7	322.1
Deferred tax liabilities:
Property, plant and equipment and intangibles	(361.8)	(410.5)
Other	(9.3)	(7.6)
Total deferred tax liabilities	(371.1)	(418.1)
Net deferred tax liabilities	$ (51.4)	$ (96.0)